Method of making sheet roofing



Oct. 13, 1931. l, DAV'ls 1,826,706

METHOD QF MAKING SHEET RooFING Filed July 12, 1929 radom 23m/23 v i V lPatented Oct. 13, 1931 i I PATENT OFFICE ISADORE D A'VISl 0F MARSHALLTOWN, IOWAv METHOD or MAKING SHEET RoorING Application filed July 12,

The principal object 'of this invention is to provide a rootinw that is economical in. manufacture, exceptionally durable 'in use and refilled. in appearance.

' A further object of my invention is to provide a 1ooingtlnit may easily be caused toA conform to the outline of the surface upon which 1t rests land one that when once installed retains lts form indefinitely.

that isnniform in :thickness and. maintains such uniformity throughout its useful life.

A still further object of my invention is toprovide avrooing thatis water proof, of great tensile strength, but lightin weight.

These and other objects will be apparent to those skilled in the'art.v

My invention consists in the method here-- inafter set forth, pointed out in my claims and illustrated in .the accompanying drawings in which:

Fig. lis a perspective view of a strip of my roofing with sections cut away to more fully-illustrate its construction.

Fig. 2 is a cross sectional view of the roofing taken Online 2-2 of Fig. 1. K I Fig; 3 is a cross sectional view of my invention illustratin the manner in which two strips "or sheets-o my roofing'are held together when resting on a supporting surface.

One of the chief objections to sheet roofing now on the market is its inability to withstand hard usage from weatherl and sun, but this has been overcomeas will be appreciated by those familiar with the art. L

.I'have used the numeral 10 to designate a metal-fabric such as screen' wire and which acts as a base in the makingsof my roofing. This metallic .screen is first immersed in raw rubber which has been reduced to' a liquid state by suitable heat. The temperature at which the liquid rubber is maintained during thls lmmersmg process should not be very high, i. e. not over one hundred and seventyive degrees Fahrenheit a'nd this is made possible'by the raw rubber being reduced to a semi-liquid state by suitable chemicals and which is well known in the art and often goes by the name of rubber comentas used in the tireindustry. In fact this raw rubber may A still'further ect is to provide a roofing y asphalt and cause it to run.

192s. serial No. 377,7e9."

be so reduced to a liquid form by thesechemicals well known in the art that the same may be applied to the metal fabric insa compara-y tively cold state. 1f desired, a small amount of asphalt may befadded to the liquid rubber to prevent it from rotting when in use. Upon withdrawing this screen it will be noted 4that it will possess a rubber coating-11, completely embedding .all the [strands and filling the mesh of the screen. However the strands of 6 0 the screen will, although covered with rubber, show in outline thereby providing a very rough surface on each side of' the sheet. The metal fabric should not-be of lgalvanized ma.

terial as Such material does not successfully stick to the rubber. After withdrawing the screen from the liquid rubber it should be hung up and allowed to dry for approximatev ly one-half hour after which time it should be dipped in hot liquid asphalt vwhich has been 701- reduced to a liquid Astate by subjectinr the Same to temperatures from one hundre and mnety to two hundred degrees Fahrenheit.

This last mentioned immersion provides a layer of asphalt 12 on each side of the sheet and 75 by the strands of the wire `forming a rough surface the asphalt will be prevented from.-

running by force of gravity and causing a' sheet of varying thicknesses.

My method of forming a rooiine` assures a sheet of uniform thickness and because of the same reason as above described the thickness will remain uniform in use when on hot days as the sun has a tendency to melt the After withdrawing the sheet from the asy phalt,`and before the asphalt has completely dried, ound slate, sand, asbestos, gravel, or the like 13 should be spread over the upper. surfacev of the sheet as shown in the drawings. This crushed or granular material will readily adhere to the asphalt and form a storm and weatherresisting surface which is very refined in appearance.

From the foregoing it will be noted that I 96 have provided a roofing of great tensile very suitable base, and giving strength, the

wire fabric 1 0 allows the sheet to be bent to 10b conform to the outline of the supporting surface 14 and to maintain that shape. lt also holds the sheet flat on the supporting surface and' prevents curling of the roofing in use and provides a durable base through which nails may be driven to hold it onto the supporting. surface.

In Fig. 3, I show a vnovel method of securing the various sheets of roofing together and onto the supporting surface. A strip of cloth fabric 15 is secured at one marginal edge of each base 10 before the dipping processes by being cemented by suitable glue or rubber cement at its inner marginal edge. This provides a flap portion which, when the sheets are laid on the supporting surface eX- tends over the sheet of roofing adjacent to it as shown in the drawings. secured to the supporting surface by nails 16 driven through the sheets into the support ing surface 14 andhaving their heads protected from rust and weather by being under the flaps of the cloth strips 15. After the roofing is laid, asphalt, tar, c ement` or the like may befplaced over and around the cloth strips, thereby' securely holding them down over the joints of the sheetsof roofing and makifng the complete roofing storm and rain proo Although l' have designated the applying of the rubber and asphalt coatings by dipping, the same may be applied by other means, such as by brush.

Once the roofing is installed on a supporting surface, it is of long life and -is not subject to damage by hail or the like.

I claim:

1. The method of making sheet roofing y consisting of taking a base, dipping said base in liquid rubber to such aneXtent as to cover the said base, dipping said rubber covered base in asphalt. and applying granular material to said asphalt.

v2. The method of making sheet roofing consisting of taking a porous base, dipping said base in liquid rubber to completely coat said Y base with the material in Which it is dipped, dipping said rubber covered porous base in asphalt, and coating one side of said asphalt with hard granular material.

3. The method of making sheet roofing consisting of taking a coarse metallic fabric, subjecting said fabric to liquid rubber tosuch an extent that the same is completely covered and the meshes filled, allowing the rubber coating to dry, and then subjecting the rubber coated metallic fabric to liquidasphalt.

4. The method of making sheet roofing consisting of taking screen Wire, dipping the same in melted rubber,j allowing therubber to cool and dry, dipping the rubber covered vscreen in melted asphalt, and applying granular rock to one side of the sheet before the asphalt is dry. Y l ISADORE DAVIS.

The sheets are 

